build fails on Windows11/conda FileNotFoundError

[davidmnilsson]

Description

Build fails with:
FileNotFoundError: [Errno 2] No such file or directory: '\tmp\xeus-python-kernel\envs\xeus-python-kernel\Scripts/pip-script.py'

Reproduce

1. conda install -c conda-forge jupyterlite-xeus-python
2. jupyter lite build

Error:
Executing transaction: done
[LiteBuildApp] ERROR | [lite] [post_build] [jupyterlite-xeus-python] [ERR] [Errno 2] No such file or directory: '\tmp\xeus-python-kernel\envs\xeus-python-kernel\Scripts/pip-script.py'
Traceback (most recent call last):
File "C:\Users\DavidNilsson\anaconda3\envs\xeus-python-kernel\Lib\site-packages\doit\doit_cmd.py", line 294, in run
return command.parse_execute(args)
...
File "C:\Users\DavidNilsson\anaconda3\Lib\shutil.py", line 256, in copyfile
with open(src, 'rb') as fsrc:
^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '\tmp\xeus-python-kernel\envs\xeus-python-kernel\Scripts/pip-script.py'

Expected behavior

Two issues,

1. it's looking for a linux \tmp style path while on Windows it's on (in the log):
   environment location: C:\tmp\xeus-python-kernel\envs\xeus-python-kernel
2. The folder and file Scripts/pip-script.py doesn't exist in C:\tmp\xeus-python-kernel...

Context

• JupyterLite version:
• jupyterlite-app-0.1.2
• jupyterlite-xeus-python-0.9.6
• python=3.10
• xeus-python=0.15.9
• anaconda3
• Operating System and version: Windows 11
• Browser and version: N/A

Building with the jupyterlite with pyodide-kernel works fine, but not with Xeus.
Tried multiple conda env setups, same issue.
Logs attached. Please advise.
XeusBuildIssueFileNotFound.txt